Structure of relations

Relations are used to connect components to assemblies. A relation consists of a "relation" tag, which contains multiple "ref" tags.

Notice

Change from REXS version 1.3

Clarification: relations may not include multiple "ref" tags with the same role. For example, it is not allowed to use multiple "part" elements in the same assembly relation. A separate relation must be created for each "part."

Table 5. The "relation" tag has the following characteristics:

	Feature	Description
Part of the REXS file	id	Unique identifier of the relation in the concrete instance of the model Data type: integer
type	Type of relation; e.g., "assembly“ Follows the naming convention Data type: string	Types of relations
order	Some relations between two components (e.g., "ordered_assembly_relation") also include an order, which is determined by the "order" tag. For example, this makes it possible to uniquely assign the bearing rows of a rolling bearing. Data type: integer The "order" always begins = 1 and increases in increments of 1.

Feature

Description

Details

Part of the REXS file

Unique identifier of the relation in the concrete instance of the model

Data type: integer

type

Type of relation; e.g., "assembly“

Follows the naming convention

Data type: string

Types of relations

order

Some relations between two components (e.g., "ordered_assembly_relation") also include an order, which is determined by the "order" tag. For example, this makes it possible to uniquely assign the bearing rows of a rolling bearing. Data type: integer

The "order" always begins = 1 and increases in increments of 1.

Table 6. Characteristics of a "ref" object:

	Feature	Description	Details
Part of the REXS file	id	ID of a component in the relation
Part of the REXS file	role	Role of the component in the relation (e.g., stage)	Types of relations
Optional in REXS file	hint	Note to make the relation easier to read; e.g., type of the referenced component, max. 40 characters

Types of relations

Type of relation

Components/roles

assembly

Connects a primary component K1 with sub-component K2

Component	Role	Comp. type
K1	assembly	all
K2	part	all

Example XML syntax

<relation id="33" type="assembly">
	<ref id="5" role="assembly" hint="shaft"/>
	<ref id="32" role="part" hint="external_load"/>
</relation>

ordered_assembly

Connects a primary component K1 with sub-component K2, specifying the order of the sub-components. The order can be specified by entering an integer with the "order" tag.

The "order" always begins = 1 and increases in increments of 1.

Component	Role	Comp. type
K1	assembly	all
K2	part	all

Example XML syntax

<relation id="15" type="ordered_assembly" order="1">
	<ref id="8" role="assembly" hint="bearing"/>
	<ref id="16" role="part" hint="bearing_row"/>
</relation>

<relation id="16" type="ordered_assembly" order="2">
	<ref id="8" role="assembly" hint="bearing"/>
	<ref id="17" role="part" hint="bearing_row"/>
</relation>

stage

Connects a stage component S with two gears, R1 and R2

Component	Role	Comp. type
S	stage	All stages
R1	gear_1	All gears
R2	gear_2	All gears

Example XML syntax

<relation id="23" type="stage">
	<ref id="3" role="stage" hint="cylindrical_stage"/>
	<ref id="7" role="gear_1" hint="cylindrical_gear"/>
	<ref id="9" role="gear_2" hint="cylindrical_gear"/>
</relation>

stage_gear_data

This relation is used to represent stage-related gear data. It connects a stage component S with a gear R and a "stage_gear_data" component.

Component	Role	Comp. type
S	stage	All stages
R	gear	All gears
D	stage_gear_data	Stage gear data (stage_gear_data )

Example XML syntax

<relation id="23" type="stage_gear_data">
	<ref id="3" role="stage" hint="cylindrical_stage"/>
	<ref id="7" role="gear" hint="cylindrical_gear"/>
	<ref id="9" role="stage_data" hint="stage_gear_data"/>
</relation>

side

For example, connects a bearing M with two components: a component IP on the inner side of the bearing, and a component OP on the outer side of the bearing.

Component	Role	Comp. type
M	assembly	concept_bearing, rolling_bearing_with_catalog_geometry, rolling_bearing_with_detailed_geometry, switchable_coupling, coupling, cylindrical_interference_fit, tapered_interference_fit, feather_key_connection, involute_spline_connection
IP	inner_part	gear_casing, shaft, side_plate, *_gear (for shaft-hub connections)
OP	outer_part	gear_casing, shaft, side_plate, *_gear (for shaft-hub connections)

Example XML syntax

<relation id="22" type="side">
	<ref id="11" role="assembly" hint="concept_bearing"/>
	<ref id="17" role="inner_part" hint="shaft"/>
	<ref id="2" role="outer_part" hint="gear_casing"/>
</relation>

flank

Used to assign a left (C1) and right (C2) tooth flank to a gear R. The right (or left) flank is the flank seen on the right (or left) side in the viewing direction of an upward-pointing tooth. The viewing direction must be specified separately for each type of gear.

Component	Role	Comp. type
R	gear	all gears
C1	left	corresponding flank component type
C2	right	corresponding flank component type

Example XML syntax

<relation id="67" type="flank">
	<ref id="8" role="gear" hint="bevel_gear"/>
	<ref id="13" role="left" hint="bevel_gear_flank"/>
	<ref id="14" role="right" hint="bevel_gear_flank"/>
</relation>

reference

Used to assign components such as materials or lubricants to a component.

Component	Role	Comp. type
R	origin	all
P	referenced	all

Example XML syntax

<relation id="40" type="reference">
	<ref id="10" role="origin" hint="cylindrical_gear"/>
	<ref id="15" role="referenced" hint="material"/>
</relation>

manufacturing_step

Used to assign a manufacturing step with tool T to a gear flank F, taking the manufacturing settings M into consideration. The "order" specifies the processing sequence. An integer is used to specify the "order." The "order" always begins = 1 and increases in increments of 1.

The manufacturing_step relation type was introduced in REXS 1.3. It replaces the ordered_reference relation, which was used to connect a gear and a tool through REXS 1.2.

Component	Role	Comp. type
F	workpiece	all gear flanks
T	tool	associated tool types
M	manufacturing_settings	associated manufacturing settings

Example XML syntax

<relation id="41" type="manufacturing_step" order="1">
	<ref id="10" role="workpiece" hint="cylindrical_gear_flank"/>
	<ref id="15" role="tool" hint="rack_shaped_tool"/>
	<ref id="16" role="manufacturing_settings" hint="cylindrical_gear_manufacturing_settings"/>
</relation>

planet_shaft

Identification of planetary shaft C2 in planetary stage C1.

Component	Role	Comp. type
C1	planetary_stage	planetary_stage
C2	shaft	shaft

Example XML syntax

<relation id="42" type="planet_shaft">
	<ref id="3" role="planetary_stage" hint="planetary_stage"/>
	<ref id="8" role="shaft" hint="shaft"/>
</relation>

central_shaft

Identification of central shaft C2 in planetary stage C1.

Component	Role	Comp. type
C1	planetary_stage	planetary_stage
C2	shaft	shaft

Example XML syntax

<relation id="43" type="central_shaft">
	<ref id="3" role="planetary_stage" hint="planetary_stage"/>
	<ref id="9" role="shaft" hint="shaft"/>
</relation>

planet_carrier_shaft

Identification of carrier shaft C2 in planetary stage C1.

Component	Role	Comp. type
C1	planetary_stage	planetary_stage
C2	shaft	shaft

Example XML syntax

<relation id="44" type="planet_carrier_shaft">
	<ref id="3" role="planetary_stage" hint="planetary_stage"/>
	<ref id="10" role="shaft" hint="shaft"/>
</relation>

planet_pin

Identification of pin C2 in planetary stage C1.

Component	Role	Comp. type
C1	planetary_stage	planetary_stage
C2	shaft	shaft

Example XML syntax

<relation id="45" type="planet_pin">
	<ref id="3" role="planetary_stage" hint="planetary_stage"/>
	<ref id="11" role="shaft" hint="shaft"/>
</relation>

In this section:

REXS Specification